Citizens Energy said today that it was not responsible for an explosion that blew off the roof of a Westside apartment building and closed part of Cold Spring Road late Thursday night.

Six people were taken to area hospitals late Thursday, after the explosion at 10:06 p.m., which also knocked down some walls of the structure at the Pangea Riverside Apartments in the 2600 block of Cold Spring Manor Drive, near the Larue D. Carter Memorial Hospital.

Citizens Energy tested its lines at the location late Thursday and also early today, spokeswoman Sarah Holsapple said, and found no leaks.

"We are certain (the incident) does not involve any of our lines," Holsapple said.

Two people — a 19-year-old woman and 20-year-old man — were taken to Eskenazi Hospital with slight burns, Reith said. Four other people were taken to IU Health Methodist Hospital for precautionary checkups.

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Fire and utility workers examine the damage caused by an explosion in a two-story apartment building at 2623 Cold Springs Manor Drive shortly after 10 p.m. Thursday May 15, 2014. There were several injuries caused by the explosion.
Joe Vitti/The Star

EMS personnel stand by in their ambulance after an explosion in a two-story apartment building at 2623 Cold Springs Manor Drive shortly after 10 p.m. Thursday May 15, 2014. There were several injuries caused by the explosion.
Joe Vitti/The Star

Utility workers examine the damage caused by an explosion in a two-story apartment building at 2623 Cold Springs Manor Drive shortly after 10 p.m. Thursday May 15, 2014. There were several injuries caused by the explosion.
Joe Vitti/The Star

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The blast left a total of 23 people needing to find other accommodations, Reith said. Apartment managers were working with those displaced to find temporary housing.

The apartments where the explosion occurred were believed to be off-campus housing for Marian University students.

Two units were damaged on the west side of the 10-unit building. Two people in the upstairs unit were taken to Eskenazi. News photos and video showed an end unit with the roof blown off and the wall bowed outward.

Holsapple said the utility is responsible for lines that run underground and to meters. Property owners are responsible for gas lines that are part of a home or building.

Audio of the 911 call made after an explosion blew the roof off an apartment building on the westside of Indianapolis, Friday, May 16, 2014.
911 audio

The two people living at the apartment where the blast originated "have no idea what caused the explosion," Reith said, "and it was not clear what they were doing at the time."

The residents did tell firefighters that they smelled either "dirty water" or "sewer gas" in the minutes before the blast, Rerith said, but they "couldn't agree on the type of smell or locate a possible source."

A woman and her 17-year-old daughter (48, 17) in an adjacent townhome were transported but did not have any injuries. Their residence sustained damage as did the roof of the building next door.

Occupants were out of the building when firefighters arrived and all occupants and pets were accounted for.

Some Marian University students live at the complex because of its proximity to the campus, university spokesman Mark Apple confirmed, but "it is not off-campus housing for Marian University students. We do not have any ownership or management stake in the apartment complex, and many people living there are not Marian University students."